I've seen and had all three metallics, and now I think I am going with the dark silver 226 once again.
My thoughgts on all three bags....
Light silver-stunning bag, very bright though. Its gorgeous, but you have to really really like bright silver. my bf referred to it as "tinfoil looking." I had a hard time seeing myself using it as an every bag for work since its so bright, so I couldn't see myself keeping it for the price.
Metallic black-its a very pretty bag, however, what I didnt' like about it is, I didn't feel it "popped" as much as the other two metallics. The black's chain is more of a grey chain so its not as bright and shiny, as the other two, It sorda blends into the bag. If you want a more muted look, and not as metallic-ey its a gorgeous bag.
Dark silver-I've been back and forth and back again on this bag. I love the color, was concered at first about the type of shoes to wear with it and the life of metallics in general. However, its great since it can go with bronze, silver or even gold with how it reflects. Seemed a bit more versatile than the bright silver for day time.
So those are my thoughts.....hope that helps!